Kohler 12RES Generator
Model: 12RES
Fuel Type: LPG/Natural Gas
A Kohler generator unit, a compact, enclosed power system with the Kohler logo and "Power Systems" branding.
The Kohler Advantage
- The Smart Choice: Known for reliability and ranked highest for value in leading consumer publications.
- Powerful: Exclusive Powerboost™ technology allows starting and running a typical 4-ton central air conditioner while powering other home appliances and electronics.
- Clean Power for Sensitive Electronics: Provides clean, stable power exceeding strict utility requirements and IEEE standards for total harmonic distortion (THD).
- Fast Response: Restores power in as little as 10 seconds.
- Quiet Operation: Offers quiet, neighborhood-friendly performance.
- Premium Warranty: Comes with a Five-Year or 2000 Hour Limited Warranty for on-grid (standby) applications.
Standard Features
- ADC-RES Advanced Digital Control: Designed for sophisticated electronics, featuring electronic speed control, digital voltage regulation, and an LED display for system status.
- Engine Features: Kohler Command PRO® OHV engine with hydraulic valve lifters for reliable performance. Digital Spark Advance Ignition (DSAI) optimizes performance for natural gas and LPG. Simple field conversion between fuels.
- Designed for Easy Installation: Features a polymer base (eliminating concrete pads), enclosure wall connections, and a load connection terminal block. Designed for outdoor installation only.
- Certifications: Meets U.S. EPA emission regulations. UL 2200/cUL listed (60 Hz models). CSA certification available (60 Hz models). Accepted by the Massachusetts Board of Registration of Plumbers and Gas Fitters.
- Warranty: 5-year/2000 hour limited warranty for on-grid (standby) applications; 18-month/1000 hour limited warranty for off-grid (non-standby) applications.
Generator Ratings
| Model | Voltage | Phase | Hz | Alternator | Natural Gas | LPG | ||
|---|---|---|---|---|---|---|---|---|
| kW/kVA | Amps | kW/kVA | Amps | |||||
| 12RES | 120/240 | 1 | 60 | 2F4 | 10.4/10.4 | 43 | 12.0/12.0 | 50 |
| 12RES | 115/230 | 1 | 50 | 2F4 | 9.3/9.3 | 40 | 10.5/10.5 | 46 |
RATINGS: Standby ratings apply to installations served by a reliable utility source. All single-phase units are rated at 1.0 power factor. The standby rating is applicable to variable loads with an average load factor of 80% for the duration of the power outage. No overload capacity is specified at this rating. Ratings are in accordance with ISO-3046/1, BS5514, AS2789, and DIN 6271.
GENERAL GUIDELINES FOR DERATING: ALTITUDE: Derate 4% per 305 m (1000 ft.) elevation above 153 m (500 ft.). TEMPERATURE: Derate 1.5% per 5.5°C (10°F) temperature increase above 16°C (60°F).
* Check appliance manufacturer's specifications for actual power requirements. Consult a Kohler Power Systems professional for exact residential power system requirements.
Application Data - Engine
Engine Specifications
- Manufacturer: Kohler
- Engine Model/Type: CH740 4-Cycle
- Cylinder Arrangement: V-2
- Displacement: 0.725 L (44 cu. in.)
- Bore and Stroke: 83 x 67 mm (3.27 x 2.64 in.)
- Compression Ratio: 9.0:1
- Main Bearings: 2, Parent Material
- Rated RPM: 3600 (60 Hz), 3000 (50 Hz)
- Max. Engine Power (kW/HP): LPG: 17.6 (23.6) [60 Hz], 15.8 (21.2) [50 Hz]; Natural Gas: 15.3 (20.5) [60 Hz], 13.8 (18.5) [50 Hz]
- Cylinder Head Material: Aluminum
- Valve Material: Steel/Stellite®
- Piston Type and Material: Aluminum Alloy
- Crankshaft Material: Heat Treated, Ductile Iron
- Governor Type: Electronic
- Frequency Regulation (no load to full load): Isochronous
- Frequency Regulation (steady state): ±0.5%
- Air Cleaner Type: Dry
Application Data - Engine Electrical
Engine Electrical System
- Ignition System: Electronic, DSAM
- Starter Motor Rated Voltage (DC): 12V
- Battery Charger, Ampere Rating: 6A
- Battery (purchased separately): Ground: Negative, Volts (DC): 12V, Quantity: 1, Recommended CCA rating (-18°C/0°F): 525, BCI Group Size: 26
Application Data - Exhaust
Exhaust System
- Exhaust Flow (at rated kW): 3.8 m³/min. (135 cfm) [60 Hz], 3.2 m³/min. (113 cfm) [50 Hz]
- Exhaust Temperature (at rated kW, dry exhaust): 760°C (1400°F)
Application Data - Lubrication
Lubricating System
- Type: Full Pressure
- Oil Capacity (with filter): 1.9 L (2.0 qt.)
- Oil Filter: Quantity: 1, Type: Cartridge
- Oil Cooler: Integral
Application Data - Operation Requirements
Cooling Air
- Total Inlet Air (m³/min. / cfm): 28.0 (990) [60 Hz], 23.4 (825) [50 Hz]
- Cooling Air (m³/min. / cfm): 26.9 (950) [60 Hz], 22.4 (790) [50 Hz]
- Combustion Air (m³/min. / cfm): 1.1 (39.2) [60 Hz], 0.9 (32.6) [50 Hz]
Application Data - Fuel Requirements
Fuel System
- Fuel Types: Natural Gas or LPG
- Fuel Supply Inlet: 1/2 NPT
- Fuel Supply Pressure (kPa / in. H₂O): Natural Gas: 0.9-2.7 (3.5-11); LPG: 1.7-2.7 (7-11)
Fuel Composition Limits
| Nat. Gas | LPG | |
|---|---|---|
| Methane, % by volume (minimum) | 90 min. | -- |
| Ethane, % by volume (maximum) | 4.0 max. | -- |
| Propane, % by volume | -- | 85 min. |
| Propene, % by volume (maximum) | 0.1 max. | 5.0 max. |
| C4 and higher, % by volume | 0.3 max. | 2.5 max. |
| Sulfur, ppm mass (maximum) | 25 max. | 25 max. |
| Lower heating value, MJ/m³ (Btu/ft³), (minimum) | 33.2 (890) | 84.2 (2260) |
* Contact your local distributor for suitability and rating derates based on fuel compositions outside these limits.
Minimum Gas Pipe Size Recommendation (in. NPT)
| Pipe Length, m (ft.) | Natural Gas (193,000 Btu/hr.) | LPG (203,000 Btu/hr.) |
|---|---|---|
| 8 (25) | 3/4 | 3/4 |
| 15 (50) | 1 | 3/4 |
| 30 (100) | 1 | 1 |
| 46 (150) | 1 1/4 | 1 |
| 61 (200) | 1 1/4 | 1 |
Fuel Consumption at % Rated Load
| % Load | Natural Gas, m³/hr. (cfh) | LPG, m³/hr. (cfh) | ||
|---|---|---|---|---|
| 60 Hz | 50 Hz | 60 Hz | 50 Hz | |
| 100% | 5.4 (193) | 4.8 (173) | 2.3 (81) | 2.1 (74) |
| 75% | 4.7 (163) | 4.2 (148) | 2.1 (75) | 1.9 (68) |
| 50% | 3.5 (124) | 3.1 (108) | 1.8 (60) | 1.5 (53) |
| 25% | 2.6 (93) | 2.4 (84) | 1.2 (45) | 1.1 (40) |
LPG Consumption (kg/hr. / lb./hr.)
| % Load | 60 Hz | 50 Hz |
|---|---|---|
| 100% | 4.3 (9.4) | 3.9 (8.6) |
| 75% | 3.9 (8.7) | 3.6 (7.9) |
| 50% | 3.4 (7.0) | 2.8 (6.2) |
| 25% | 2.2 (5.2) | 2.1 (4.7) |
LPG conversion factors: 8.58 ft.³ = 1 lb.; 0.535 m³ = 1 kg; 36.39 ft.³ = 1 gal.
Nominal fuel rating: Natural gas: 37 MJ/m³ (1000 Btu/ft.³); LPG: 93 MJ/m³ (2500 Btu/ft.³)
Alternator
Alternator Features
- Compliance with NEMA, IEEE, and ANSI standards for temperature rise.
- Self-ventilated and dripproof construction.
- Vacuum-impregnated windings with epoxy varnish for dependability and long life.
- Superior voltage waveform and minimum harmonic distortion from skewed alternator construction.
- Digital voltage regulator with ±1.5% no-load to full-load RMS regulation.
- Rotating-field alternator with static exciter for excellent load response.
- Skewed generator construction produces a smooth AC waveform.
Alternator Specifications
- Manufacturer: Kohler
- Output Reconnectable: 120/240
- Type: 2-Pole, Rotating Field
- Leads, Quantity: 4
- Voltage Regulator: Digital
- Insulation Material: NEMA MG1-1.66, Class H
- Temperature Rise: Class H
- Bearing: 1, Sealed Ball
- Coupling: Direct
- Amortisseur Windings: Full
- Voltage Regulation (no-load to full-load RMS): ±1.5%
- One-step Load Acceptance: 100% of Rating
- Peak Motor Starting kVA @ 240 V: 32
Sound Data
Model 12RES 8-point logarithmic average sound level is 65 dB(A). The lowest point sound level is 63 dB(A). All sound levels are measured at 7 meters (23 ft.) with no load.
ADC-RES Controller
The ADC-RES Advanced Digital Control panel, featuring a membrane keypad with arrow keys and a central LED display showing generator status.
Controller Features
- Membrane Keypad: Arrow keys for status display navigation; password-protected access for configuration and adjustments; system voltage/frequency selection and engine configuration; voltage, gain, and engine speed adjustment.
- LED Display: Shows engine runtime (hours), output voltage (VAC), output frequency (Hz), battery voltage (VDC), crank cycle status, setup information, software version, and faults.
- Faults Displayed: High battery voltage, high engine temperature, low battery voltage, low oil pressure, overcrank, overfrequency, overspeed, overvoltage, underfrequency, undervoltage.
- Compact controller integrally mounted to the generator set.
- Remote two-wire start/stop capability.
- Digital isochronous governor maintains steady-state speed at all loads.
- Digital voltage regulation: ±1.5% RMS no-load to full-load.
- Automatic start with programmed cranking cycle.
- Field-upgradeable application software.
- Front-access DB9 connector for software upgrade.
- Generator set master switch (Run/Off-Reset/Auto) on the junction box.
Contact Information
Kohler Co.
Kohler, Wisconsin 53044 USA
Phone: 920-457-4441, Fax: 920-459-1646
For nearest sales/service outlet in US/Canada, phone 1-800-544-2444
KOHLERPower.com
Kohler Power Systems Asia Pacific Headquarters
7 Jurong Pier Road
Singapore 619159
Phone: (65) 6264-6422, Fax: (65) 6264-6455
Available Accessories
Approvals and Listings
- CSA Certification (60 Hz)
Communication Accessories
- OnCue® Generator Management System (see specification sheet G6-98)
- Remote harness, 25 ft.
- Remote harness, 100 ft.
Electrical System
- Battery
- Battery heater
- Relay kit: auxiliary run relay and common fault relay
Fuel System
- Gas strainer
- Flexible fuel line
Maintenance
- Maintenance kits
- General maintenance literature kit
- Overhaul literature kit
- Production literature kit
Starting Aids
- Carburetor heater, 120 VAC (recommended for reliable starting below 0°C [32°F])
Transfer Switch
- Kohler automatic transfer switch
Model RDT Automatic Transfer Switch
- UL listed
- Available in 100, 200, or 400 amps (200 amp service entrance-rated model available)
- 240 VAC/60 Hz or 220 VAC/50 Hz
- Available with or without built-in load center
- Equipped with MPAC™ 500 microprocessor-based controls
- User-friendly controller interface with easy-to-read international symbols
Dimensions and Weights
Overall Size (L x W x H): 1123 x 726 x 803 mm (44.2 x 28.6 x 31.6 in.)
Weight: 182 kg (400 lb.)
Shipping weight: 195 kg (430 lb.)
Diagram showing overall dimensions with labels for length (L), width (W), and height (H), with corresponding measurements provided.
NOTE: These drawings are provided for reference only and should not be used for planning installation. Contact your local distributor for more detailed information.
